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Section §173.306: Limited quantities of compressed gases

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response.

Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 173.306 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0068 UL Solutions Kevin Skerrett View
23-0034 KTM North America, Inc. Mr. John Hinz View
22-0045 Parker Hannifin Corporation Erik Steinbeck View
20-0016 SDS Refrigerant Service Brian Conners View
19-0024 AMTROL Water Systems David Beretta View
17-0096 Tracerco Andrew Booton View
17-0098 KWS Training, Inc. Mr. Ken Summer View
17-0074 Western International Gas & Cylinders, Inc. Ms. Kathy McKenzie View
98-0169 Mind2Market Inc. Mr. Ray Williams View
12-0126 Leland Limited, Inc. Ms. Dawn Rakita View
12-0260 TEN-E Packaging Services, Inc. Mr. Robert J. Ten Eyck View
01-0112 Micro Care Corporation Mr. Jay S. Tourigny View
14-0181 Duke Energy Corporation Mr. Chuck Denny View
13-0178 ThyssenKrupp North America, Inc. Mr. Michael J. Bauer View
12-0038 Mr. Charles E. Tudor View
11-0210 Patterson Companies, Inc. Mr. Robb Boros View
16-0027 Graham Packaging Company, L.P. Mr. Matthew Parker View
15-0179 John Deere TCAO Mr. Brad Storm View
12-0004 Regulatory Resources, Inc. Mr. Wade Winters View
10-0118 Fox Racing Ms. Jennifer Lucia View
08-0130 Thermo Fisher Scientific Mr. Gene Sanders View
98-0560 Spectra Gases, Inc. Mr. William Miller View
03-0001 Summit Environmental Corporation, Inc. Mr. Keith Parker View
99-0120 Chemtronics Mr. Bill Dowse View
09-0105 ShipMate, Inc. Mr. Steven Charles Hunt View
98-0350 TEN E Packaging Mr. Robert J. Ten Eyck View
15-0054 Intrepid Coatings, Inc Mr. Robert D. Commisso View
06-0284 Thompson Coburn LLP Mr. Anthony A. Anderson  View
00-0163 IKI Manufacturing Co., Inc. Mr. Ken Johnson View
15-0077 Lawrence Livermore National Laboratory Mr. Rod Coleman View
02-0219 Mountain Safety Research Joe Yelverton View
09-0290 The Testor Corporation Mr. Scott Anderson View
98-0283 Cotkin & Collins Mr. Cooper Collins View
00-0226 Triangle Environmental Services Mr. Wayne Stollings View
00-0037 North American Group Ms. Cassie Mayrand-Burney View
03-0133 Manager of Sales Administration Hardringe Inc. Ms. Andra Russell View
03-0015 Diamond Products Company Mr. Thomas M. Sassor, Sr. View
11-0168 United Brands Mr. Jimmy Zahriya View
99-0318 Printronix Ms. Kathryn Parham View
05-0081 Chemical Accident Reconstruction Service, Inc. Mr. Michael Fox View
98-0563 STC Technologies, Inc. R. Sam Niedbala, Ph.D.,BCFE View
99-0297 Neiman Marcus Direct Mr. Frank Ramirez View
11-0161 Young & Franklin Inc. Mr. Greg Michalowski View
12-0227 IQ Products Company Mr. P. Yohanne Gupta View
06-0097 Ms. Kristen Taddonio  View
98-0559 Kold Ban Internal, Ltd. Mr. James O. Burke View
12-0095 Guerilla Air Mr. Sam Newman View
06-0142 Associated Spring Raymond Mr. Thomas J. Fischer View
13-0118 Mr. Ed Mazzullo View
08-0093 Woodard & Curran Ms. Kelly V. Camp View
07-0143 PerkinElmer Optoelectronics Mr. David Harmon View
08-0193 URS Corporation Ms. Erin N. Jarman View
13-0122R URS Corporation Mr. Andrew N. Romach View
09-0276 JJ Keller Mr. Leonard Satkowski View
14-0018 URS Corporation Mr. Andy N. Romach View
04-0093 Sovereign Specialty Chemicals Mr. Kevin W. Johnston View
13-0012 Amex Int'l, Inc. Mr. Arlee Mueller View
04-0203 Chemical Accident Reconstruction Services, Inc. Mr. Michael Fox View
16-0010 Mr. Jason Miller View
04-0277 Carleton Technologies, Inc. Ms. Amy Vollmer View
11-0311 Weatherford International Mr. Tim Redwine View
06-0183 Devon Energy Corporation Mr. Joe Huber View
07-0130 Dangerous Goods Advisory Council Mr. Frits Wybenga View
15-0220 KTM North America, Inc. Ms. Cheryl Webb View
11-0049 EnergySolutions, Inc. Ms. Merrie Schilperoort View
07-0067 Alcoa KAMA Mr. Chris Meeks View
07-0067R Alcoa KAMA Mr. Chris Meeks View
09-0304 Bioxygen Distribution Corporation Mr. Kevin DelGaudio View
05-0022 Manufacturing Company Mr. David H. Baker View
05-0121 Covington & Burling Mr. Zachary G. Parks View
03-0029 Carleton Technologies, Inc. Mr. John Szymanski  View
09-0212 Horizon Hobby, Inc. Mr. Travis Morenz View
15-0237 Slide Products, Inc. Mr. Michael Muth View
09-0010 Pentair Water Group, Inc. Mr. John F. Di Leo View
05-0190 EHS Associates, Inc. Mr. Daniel J. Young View
08-0139 URS Corporation Ms. Erin N. Jarman View
07-0095 Mr. Rick Kite View
17-0033 Environmental Resource Center Ms. Rebecca Spaulding View
98-0273 Arctic Foundations, Inc. Mr. Edward Yarmak, Jr., P.E. View
13-0013 Global Products and Services, Baker Hughes Mr. Aubrey R. Campbell View
98-0275 Miller Products Company, Inc. Ms. Pat Czeczuga View
13-0059 BEAM Strategic Solutions Mr. Mark F. Kozak View
08-0270 URS Corporation Mr. Andrew Romach View
02-0188 Raytheon Company Ted A. Rust View
05-0197 DS Containers Mr. James R. Jandora View
06-0200 Mr. Robert D. Howerton, Ph.D. View
17-0021 Phase Four, Inc. Mr. Daniel Nash View
10-0040 University of Wisconsin Radiation Calibration Laboratory Ms. Wendy S. Kennan View
06-0233 Air-4Life, Ltd. Mr. Eric Kimel View
14-0148 URS Corporation Mr. Andrew Romach View
14-0142 Transportation Compliance Associates, Inc. Mr. Mike Alston View